3KX1:
reference: Design and optimization of a series of novel 2-cyano-pyrimidines as cathepsin K inhibitors., Rankovic Z, Cai J, Kerr J, Fradera X, Robinson J, Mistry A, Hamilton E, McGarry G, Andrews F, Caulfield W, Cumming I, Dempster M, Waller J, Scullion P, Martin I, Mitchell A, Long C, Baugh M, Westwood P, Kinghorn E, Bruin J, Hamilton W, Uitdehaag J, Zeeland MV, Potin D, Saniere L, Fouquet A, Chevallier F, Deronzier H, Dorleans C, Nicolai E, Bioorg Med Chem Lett. 2010 Mar 1;20(5):1524-1527. Epub 2010 Jan 25. PMID: 20149657

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